CN105789728B - Battery liquid cooling plate, preparation method thereof, battery module, battery pack and electric automobile - Google Patents
Battery liquid cooling plate, preparation method thereof, battery module, battery pack and electric automobile Download PDFInfo
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- CN105789728B CN105789728B CN201410811906.1A CN201410811906A CN105789728B CN 105789728 B CN105789728 B CN 105789728B CN 201410811906 A CN201410811906 A CN 201410811906A CN 105789728 B CN105789728 B CN 105789728B
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- cooling plate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a battery liquid cooling plate, a preparation method thereof, a battery module, a battery pack and an electric automobile. This liquid cooling plate includes: the device comprises a lower liquid cooling plate, an upper liquid cooling plate with local deformation, and a flow passage formed by the upper liquid cooling plate and the lower liquid cooling plate in an enclosing way through the local deformation of the upper liquid cooling plate; the edge of the deformed part of the upper liquid cooling plate is connected with the lower liquid cooling plate in an atom combination mode. The battery liquid cooling plate has lighter weight, simpler structure, better connection strength and sealing performance and can be obtained without the step of punching and forming a flow channel.
Description
Technical Field
The invention relates to a battery liquid cooling plate, a preparation method thereof, a battery module, a battery pack and an electric automobile; in particular to a battery liquid cooling plate, a method for preparing the battery liquid cooling plate and the battery liquid cooling plate prepared by the method, a battery module, a battery pack comprising the battery module, and an electric vehicle comprising the battery pack.
Background
The battery liquid cooling plate is an essential component of the battery pack, and is provided with a flow channel for cooling liquid to flow so as to realize heat dissipation for the battery pack.
At present, the liquid cooling plate of the battery is usually manufactured by punching an upper liquid cooling plate to form a flow channel and then welding the upper liquid cooling plate and a lower liquid cooling plate together. When the designed flow passages are different, different stamping dies need to be arranged, so that the manufacturing cost of the liquid cooling plate is increased. In addition, the liquid cooling plate can be subjected to the action of high temperature in the existing welding process, and is easy to deform after welding, so that the use of the liquid cooling plate is influenced. And the joint and sealing strength of the welding seam formed by the existing welding method is insufficient.
Therefore, there is a need to provide a new liquid cooling plate for a battery, which has higher connection and sealing strength, and is simple to manufacture without the influence of welding deformation.
Disclosure of Invention
The invention aims to overcome the defects of the existing battery liquid cooling plate, and provides a battery liquid cooling plate, a preparation method thereof, a battery module, a battery pack and an electric automobile.
In order to achieve the above object, the present invention provides a battery liquid cooling plate, comprising: the device comprises a lower liquid cooling plate, an upper liquid cooling plate with local deformation, and a flow passage formed by the upper liquid cooling plate and the lower liquid cooling plate in an enclosing way through the local deformation of the upper liquid cooling plate; the edge of the deformed part of the upper liquid cooling plate is connected with the lower liquid cooling plate in an atom combination mode.
The invention also provides a preparation method of the battery liquid cooling plate, which comprises the following steps: placing the upper liquid cooling plate and the lower liquid cooling plate in parallel at intervals; the upper liquid cooling plate and the lower liquid cooling plate are welded by electromagnetic pulse, the upper liquid cooling plate at the welding position deforms and is connected with the lower liquid cooling plate to form a connecting part, and a flow channel is formed between every two adjacent connecting parts.
The invention also provides a battery liquid cooling plate prepared by the method provided by the invention.
The invention also provides a battery module, which comprises a plurality of battery liquid cooling plates; the battery liquid cooling plate is the battery liquid cooling plate provided by the invention.
The invention also provides a battery pack which comprises a plurality of battery modules, wherein the battery modules are the battery modules provided by the invention.
The invention also provides an electric automobile which comprises a plurality of battery packs, wherein the battery packs are the battery packs provided by the invention.
According to the battery liquid cooling plate provided by the invention, the edge of the deformation part of the upper liquid cooling plate and the lower liquid cooling plate are connected in an atomic combination manner, so that a high specific heat material with a good heat dissipation effect is realized, for example, the battery liquid cooling plate is formed by combining copper and a light material, the strength of the battery liquid cooling plate can be ensured, a better heat dissipation effect and light weight can be realized, and better connection strength and sealing performance can be realized. In addition, in the invention, the upper liquid cooling plate can be deformed to form a flow channel by adopting electromagnetic pulse welding during connection, so that the stamping forming step in the prior art is saved, and the forming cost of the liquid cooling plate of the battery is reduced.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 shows a pre-welded structure of a liquid cooled plate;
FIG. 2 shows a structure of a liquid cooling plate after welding;
FIG. 3 is a three-dimensional view of the liquid cooled plates after welding;
FIG. 4 is a flow channel shape according to an embodiment of the present invention;
FIG. 5 is a flow channel shape according to another embodiment of the present invention;
FIG. 6 is a flow channel shape according to another embodiment of the present invention;
FIG. 7 is a gold phase diagram of the electromagnetic pulse weld of the present invention (the weld in the box has no transition layer);
FIG. 8 is a diagram of the gold phase at the laser weld joint (the joint in the circle is the transition layer);
FIG. 9 is a gold phase diagram of new alloy fracture at a laser welded joint.
Description of the reference numerals
1. A lower liquid cooling plate 2, an upper liquid cooling plate 3, a flow passage 4, a joint 5 and an undeformed part
6. Deformed part
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The present invention provides a battery liquid cooling plate, as shown in fig. 2, the liquid cooling plate includes: the device comprises a lower liquid cooling plate 1, an upper liquid cooling plate 2 which is locally deformed, and a flow passage 3 which is formed by the local deformation of the upper liquid cooling plate 2 and is surrounded by the lower liquid cooling plate 1; the edge of the deformed portion 6 of the upper liquid-cooling plate 2 is connected to the lower liquid-cooling plate 1 by atomic bonding.
As described in particular in fig. 2, the edge of the deformed portion 6 of the upper liquid-cooled plate 2 is joined to the lower liquid-cooled plate 1 at the weld 4. The undeformed portion 5, the deformed portion 6 and the lower liquid cold plate 1 surround to form the flow passage 3.
According to the invention, the battery liquid cooling plate can provide a better heat dissipation effect by utilizing the high specific heat performance of the upper liquid cooling plate, and the battery liquid cooling plate can be lightened by adopting a light material. The conventional method is not easy to realize the welding between different metals, and the upper liquid cooling plate forming flow channel needs to be welded firstly, which takes labor. In the invention, the electromagnetic pulse welding is used for welding two different metals, and simultaneously the upper liquid cooling plate is deformed to just form a flow channel, the pre-stamping forming is not needed, meanwhile, the non-melting welding mode is adopted, the influence of the heating of the conventional welding is avoided, and the welding can be carried out without error and deformation without generating deformation amount during the welding.
According to the invention, the connection is a non-melting welding mode, preferably, the lower liquid cooling plate and the upper liquid cooling plate are different metals, and no transition layer exists on the interface where the edge of the deformed part of the upper liquid cooling plate is connected with the lower liquid cooling plate. The transition layer is a metal melting recrystallization structure formed by melting the metals of the cover plate and the shell in a welding mode or a brazing layer formed by welding the cover plate and the shell. As shown in fig. 7 for the gold phase diagram at weld 4 in fig. 2, the box is free of transition layers, in particular, no newly created alloy structure.
According to the present invention, it is preferable that the width of the portion where the edge of the deformed portion of the upper liquid-cooling plate is connected to the lower liquid-cooling plate is 1 to 20 mm; preferably the width is 8-15 mm. The width of this portion at the weld 4 in fig. 2.
According to the invention, the connection strength of the part, which is connected with the lower liquid cooling plate, of the edge of the deformation part of the upper liquid cooling plate is preferably 100-800 MPa; preferably 400-600 MPa.
According to the present invention, it is preferable that the sealing strength of a portion where the edge of the deformed portion of the upper liquid-cooling plate is connected to the lower liquid-cooling plate is 0.01 to 0.2 MPa; preferably 0.01 to 0.06 MPa.
According to the invention, preferably, the upper liquid cooling plate is made of high specific heat metal, and the lower liquid cooling plate is made of light metal; preferably, the upper liquid cooling plate is at least one of copper, copper alloy and steel; the lower liquid cooling plate is at least one of aluminum, aluminum alloy and magnesium alloy.
According to the present invention, the width of the flow channel is represented by letter W and the height of the flow channel is represented by letter t in fig. 2, and preferably, the width of the flow channel is 3 to 30mm and the height of the flow channel is 0.3 to 2 mm. The shape of the flow channel can be designed according to the requirement of the battery liquid cooling plate, and preferably, the flow channel can be a straight line type or a bent type. For example, may be in the shape of a U as shown in fig. 4, a W as shown in fig. 5, and an F as shown in fig. 6.
The invention also provides a preparation method of the battery liquid cooling plate, which comprises the following steps: placing the upper liquid cooling plate and the lower liquid cooling plate in parallel at intervals; the upper liquid cooling plate and the lower liquid cooling plate are welded by electromagnetic pulse, the upper liquid cooling plate at the welding position deforms and is connected with the lower liquid cooling plate to form a connecting part, and a flow channel is formed between every two adjacent connecting parts.
According to the present invention, it is preferable that the distance between the adjacent two connection portions is 3 to 30 mm.
According to the invention, the gap of the spacing is preferably 0.3-2 mm.
According to the present invention, preferably, the two adjacent connecting portions are parallel.
According to the present invention, it is preferable that the welding energy of the electromagnetic pulse welding is 16 to 64 KJ.
The invention also provides a battery liquid cooling plate prepared by the method provided by the invention.
The invention also provides a battery module, which comprises a plurality of battery liquid cooling plates; the battery liquid cooling plate is the battery liquid cooling plate provided by the invention.
In the invention, the battery liquid cooling plate is arranged in the battery module, can be arranged between the single batteries, and also can be arranged on the outer surface of the battery module to provide cooling and heat dissipation for the batteries.
The invention also provides a battery pack which comprises a plurality of battery modules, wherein the battery modules are the battery modules provided by the invention.
The invention also provides an electric automobile which comprises a plurality of battery packs, wherein the battery packs are the battery packs provided by the invention.
The present invention will be described in detail below by way of examples.
In the following examples, the joint strength was measured by a tensile test method using GP-TS2000M from high-quality testing company; the sealing strength was measured by an air tightness test method using a CPB air tightness tester of BYD.
Example 1
An upper liquid cooling plate (copper material) and a lower liquid cooling plate (aluminum alloy material) are placed in parallel as shown in fig. 1, the gap is 2mm, electromagnetic pulse welding (welding equipment model PS48-16/25, PST company) is applied to the upper liquid cooling plate, the welding energy is 16KJ, a battery liquid cooling plate is obtained, the welded structure is shown in fig. 2 and 3, the width of a connected part is 8mm, the width of a flow channel is 15mm, and the height is 2 mm. The flow channel formed had a shape as shown in FIG. 4 and a weight of 150 g.
And testing the connection strength and the sealing performance of the obtained battery liquid cooling plate, wherein the connection strength is 400MPa, and the sealing strength is 0.01 MPa.
The structural morphology of the edge of the deformed part of the upper liquid cooling plate and the part connected with the lower liquid cooling plate is observed by a metallographic microscope, and as shown in fig. 7, an alloy phase diagram does not exist.
Example 2
An upper liquid cooling plate (copper alloy material) and a lower liquid cooling plate (aluminum material) are placed in parallel as shown in fig. 1, the gap is 1.5mm, electromagnetic pulse welding is applied to the upper liquid cooling plate, the welding energy is 20KJ, and a battery liquid cooling plate is obtained, wherein the welded structure is shown in fig. 2, the width of a connected part is 10mm, the width of a flow channel is 20mm, and the height is 1.5 mmm. The flow channel formed had a shape as shown in FIG. 5 and a weight of 150 g.
And testing the connection strength and the sealing performance of the obtained battery liquid cooling plate, wherein the connection strength is 300MPa, and the sealing strength is 0.02 MPa.
And observing the structural appearance of the edge of the deformed part of the upper liquid cooling plate and the part connected with the lower liquid cooling plate by using a metallographic microscope, wherein the structural appearance is similar to that shown in figure 7, and an alloy phase diagram is not generated.
Example 3
An upper liquid cooling plate (steel material) and a lower liquid cooling plate (magnesium alloy material) are placed in parallel as shown in figure 1 at an interval of 1.5mm, electromagnetic pulse welding is applied to the upper liquid cooling plate, welding energy is 32KJ, and a battery liquid cooling plate is obtained, wherein the welded structure is shown in figure 2, the width of a connected part is 15mm, the width of a flow channel is 20mm, and the height is 1.5 mm. The flow channel formed had a shape as shown in FIG. 6 and a weight of 150 g.
And testing the connection strength and the sealing performance of the obtained battery liquid cooling plate, wherein the connection strength is 450MPa, and the sealing strength is 0.035 MPa.
And observing the structural appearance of the edge of the deformed part of the upper liquid cooling plate and the part connected with the lower liquid cooling plate by using a metallographic microscope, wherein the structural appearance is similar to that shown in figure 7, and an alloy phase diagram does not exist.
Comparative example 1
The upper liquid cooling plate (copper material) and the lower liquid cooling plate (copper material) are placed in parallel, the gap is 0mm, laser welding (welding equipment model DISC8002, general fast company) is applied to the upper liquid cooling plate, welding power is 8KW, welding speed is 80mm/s, a battery liquid cooling plate is obtained, and the welded structure is shown in figures 2 and 3, wherein the width of the joint is 1.5mm, the width of a flow channel is 20mm, and the height is 1.5 mm. The flow channel formed had the shape shown in FIG. 4 and weighed 250 g.
And testing the connection strength and the sealing performance of the obtained battery liquid cooling plate, wherein the connection strength is 300MPa, and the sealing strength is 0.02 MPa.
The structural appearance of the edge of the deformed part of the upper liquid cooling plate and the connecting part of the lower liquid cooling plate is observed by a metallographic microscope, and as shown in figures 8 and 9, a new alloy phase diagram exists.
It can be seen from the results of the above examples and comparative examples that the liquid cooling plate of the battery provided by the present invention has the advantages of lighter weight, simpler structure, better connection strength and sealing performance, and no need of stamping and forming the flow channel.
Claims (17)
1. A battery liquid cooling plate, comprising: the device comprises a lower liquid cooling plate, an upper liquid cooling plate with local deformation, and a flow passage formed by the upper liquid cooling plate and the lower liquid cooling plate in an enclosing way through the local deformation of the upper liquid cooling plate; the edge of the deformed part of the upper liquid cooling plate is connected with the lower liquid cooling plate in an atom combination mode; the connection strength of the part, which is connected with the lower liquid cooling plate, of the edge of the deformed part of the upper liquid cooling plate is 100-800MPa, and the sealing strength of the part, which is connected with the lower liquid cooling plate, of the edge of the deformed part of the upper liquid cooling plate is 0.01-0.2 MPa;
the preparation method of the battery liquid cold plate comprises the following steps: placing the upper liquid cooling plate and the lower liquid cooling plate in parallel at intervals; welding an upper liquid cooling plate and a lower liquid cooling plate by adopting electromagnetic pulse, connecting the upper liquid cooling plate and the lower liquid cooling plate at the welding position to form a connecting part, and forming a flow channel between two adjacent connecting parts;
the welding energy of the electromagnetic pulse welding is 32-64 KJ;
the runner is W-shaped or F-shaped.
2. The battery liquid cooling plate of claim 1, wherein the lower liquid cooling plate and the upper liquid cooling plate are different metals, and there is no transition layer at an interface where an edge of the deformed portion of the upper liquid cooling plate connects with the lower liquid cooling plate.
3. The battery fluid-cooling plate of claim 1, wherein a width of a portion where an edge of the deformed portion of the upper fluid-cooling plate is connected to the lower fluid-cooling plate is 1-20 mm.
4. The battery fluid-cooled plate of claim 3, wherein the portion of the upper fluid-cooled plate where the edge of the deformed portion connects to the lower fluid-cooled plate has a width of 8-15 mm.
5. The battery liquid cooling plate of claim 1, wherein the connection strength of the portion where the edge of the deformed portion of the upper liquid cooling plate is connected to the lower liquid cooling plate is 400-600 MPa.
6. The battery fluid-cooling plate of claim 1, wherein a sealing strength of a portion where the edge of the deformed portion of the upper fluid-cooling plate is connected to the lower fluid-cooling plate is 0.01 to 0.06 MPa.
7. The battery fluid cooled plate of any one of claims 1-5, wherein the upper fluid cooled plate is a high specific heat metal and the lower fluid cooled plate is a lightweight metal.
8. The battery fluid cooling plate of claim 7, wherein the upper fluid cooling plate is at least one of copper, a copper alloy, and steel; the lower liquid cooling plate is at least one of aluminum, aluminum alloy and magnesium alloy.
9. The battery fluid cooling plate of any one of claims 1 to 5, wherein the width of the flow channel is 3 to 30mm and the height of the flow channel is 0.3 to 2 mm.
10. A preparation method of a battery liquid cold plate comprises the following steps: placing the upper liquid cooling plate and the lower liquid cooling plate in parallel at intervals; welding an upper liquid cooling plate and a lower liquid cooling plate by adopting electromagnetic pulse, connecting the upper liquid cooling plate at the welding position with the lower liquid cooling plate to form a connecting part, forming a flow channel between two adjacent connecting parts, wherein the connecting strength of the part for connecting the edge of the deformation part of the upper liquid cooling plate with the lower liquid cooling plate is 800MPa, and the sealing strength of the part for connecting the edge of the deformation part of the upper liquid cooling plate with the lower liquid cooling plate is 0.01-0.2 MPa; the welding energy of the electromagnetic pulse welding is 32-64 KJ.
11. The method of claim 10, wherein the distance between two adjacent connecting portions is 3-30 mm.
12. A method according to claim 10 or 11, wherein the spaced gap is 0.3-2 mm.
13. The method of claim 10 or 11, wherein the two adjacent connecting portions are parallel.
14. A battery fluid cold plate made by the method of any one of claims 10-13.
15. A battery module comprises a plurality of battery liquid cooling plates; wherein the battery fluid cooled plate is as claimed in any one of claims 1 to 9 and 14.
16. A battery pack comprising a plurality of battery modules, wherein the battery module is the battery module according to claim 15.
17. An electric vehicle comprising a plurality of battery packs, wherein the battery packs are the battery packs of claim 16.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410811906.1A CN105789728B (en) | 2014-12-23 | 2014-12-23 | Battery liquid cooling plate, preparation method thereof, battery module, battery pack and electric automobile |
| PCT/CN2015/098291 WO2016101872A1 (en) | 2014-12-23 | 2015-12-22 | Battery cooling plate assembly and method for preparing the same, battery module, battery package and electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410811906.1A CN105789728B (en) | 2014-12-23 | 2014-12-23 | Battery liquid cooling plate, preparation method thereof, battery module, battery pack and electric automobile |
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| Publication Number | Publication Date |
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| CN105789728A CN105789728A (en) | 2016-07-20 |
| CN105789728B true CN105789728B (en) | 2020-07-10 |
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| WO (1) | WO2016101872A1 (en) |
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| AT520018B1 (en) * | 2017-06-13 | 2020-02-15 | Miba Emobility Gmbh | accumulator |
| AT16081U1 (en) * | 2017-07-03 | 2019-01-15 | Miba Frictec Gmbh | accumulator |
| AT520154B1 (en) | 2017-07-03 | 2019-04-15 | Miba Frictec Gmbh | accumulator |
| CN107394310B (en) * | 2017-08-01 | 2019-09-03 | 天津市捷威动力工业有限公司 | Power battery cooling structure and system |
| KR102248228B1 (en) * | 2017-09-26 | 2021-05-03 | 주식회사 엘지화학 | Battery module housing by applying Electromagnetic pulse technology and Method for manufacturing the same |
| CN107994292A (en) * | 2017-11-27 | 2018-05-04 | 常州常发制冷科技有限公司 | Bottom cold plate for automobile batteries heat dissipation |
| AT521296B1 (en) | 2018-06-12 | 2020-02-15 | Miba Ag | accumulator |
| DE102020113425B3 (en) * | 2020-05-18 | 2021-11-18 | Benteler Automobiltechnik Gmbh | Temperature control device for battery modules |
| CN111889875A (en) * | 2020-08-04 | 2020-11-06 | 索格菲（苏州）汽车部件有限公司 | Processing technology of battery cooling plate |
| KR20220170339A (en) * | 2021-06-22 | 2022-12-29 | 주식회사 엘지에너지솔루션 | Battery module and battery pack including the same |
| CN115548504A (en) * | 2021-06-30 | 2022-12-30 | 比亚迪股份有限公司 | Battery cold plate and battery system |
| CN118056314A (en) * | 2021-10-05 | 2024-05-17 | 3M创新有限公司 | Cooling plate assembly, method of making the same, and curable composition |
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| Publication number | Publication date |
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| CN105789728A (en) | 2016-07-20 |
| WO2016101872A1 (en) | 2016-06-30 |
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